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    SubjectRe: Bad SSD performance with recent kernels
    2012/1/30 Eric Dumazet <>:
    > Le lundi 30 janvier 2012 à 11:17 +0800, Shaohua Li a écrit :
    >> 1M block size is slow, I guess it's CPU related.
    >> And as for the big regression with newer kernel than 2.6.38, please
    >> check if idle=poll
    >> helps. CPU idle dramatically impacts disk performance and even latest
    >> cpuidle governor
    >> doesn't help for some CPUs.
    > No change with idle=poll
    I mean the big regression might be related to CPU idle. because I
    saw really bad performance with CPU idle with some CPUs.

    The 1M block size performance is lower than 128K is not. but I still
    guess it's CPU related (like copy). The test result is always like this
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